18660290 has 16 divisors (see below), whose sum is σ = 36642240. Its totient is φ = 6785520.

The previous prime is 18660287. The next prime is 18660307. The reversal of 18660290 is 9206681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84710 + ... + 84929.

It is an arithmetic number, because the mean of its divisors is an integer number (2290140).

Almost surely, 2^18660290 is an apocalyptic number.

18660290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18660290 is a deficient number, since it is larger than the sum of its proper divisors (17981950).

18660290 is a wasteful number, since it uses less digits than its factorization.

18660290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169657.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18660290 is about 4319.7557801339. The cubic root of 18660290 is about 265.2402709893.

The spelling of 18660290 in words is "eighteen million, six hundred sixty thousand, two hundred ninety".